You only have to purchase an app ONCE from Blackberry App World and have it loaded on one or all of your Blackberry devices.
You must be logged in with the same Blackberry ID on all devices. Purchases are tied to your Blackberry ID, so you must have the same account set up on all your devices.
USBMIS Thank you for your support to the Blackberry Playbook. Please continue to put your Apps in Blackberry App World. We Really appreciate it as clinical professionals.